Effect of the mechanical activation on the photoelectrochemical properties of anatase powders |
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Authors: | S. Palmas A.M. Polcaro J. Rodriguez Ruiz A. Da Pozzo A. Vacca M. Mascia F. Delogu P.C. Ricci |
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Affiliation: | 1. Dipartimento di Ingegneria Chimica e Materiali, Università degli Studi di Cagliari, piazza d''Armi, 09123 Cagliari, Italy;2. Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, S.P. Monserrato-Sestu 09042 Cagliari, Italy |
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Abstract: | Mechanically activated anatase powders were used to assemble thin film electrodes for electrophotocatalytic applications. Flat band potential of the different samples, estimated from the dependence of photopotential on the light intensity, as well as photocurrent vs potential curves were measured at samples milled for different times and compared with those of the untreated anatase. The maximum performance is achieved at samples milled for very short times, at which the mechanical process gives rise to a mixed-phase titania catalyst constituted by anatase and TiO2(II) phases. Electrochemical Impedance Spectroscopy measurements were also performed in order to individuate the controlling step of the photoelectrochemical process of water splitting. |
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Keywords: | Mechanical activation Photoelectrocatalysis Mixed-phase titania catalyst UVA irradiation |
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